The country's power system is operating through five regional grids. Till December 31, the Northern, Eastern, Western and North-eastern regions' grids were connected synchronously while Southern grid was connected through HVDC (High Voltage Direct Current) links.

"Synchronous integration of Southern grid with rest of the national power grid shall not only augment the inter- regional power transfer capacity of Southern region but also relieve the congestion being experienced in few transmission corridors," the Power Ministry had said on January 1.

"This will be a great boost for further economic growth of the country. It is likely to take a few months before power flow over this line is stabilised," it had said.

Out of the country's total installed generation capacity of 2,32,164 MW, Southern region accounted for 57,529 MW at the end of November 2013.